Terminal and radio communication method

Abstract

A user terminal is disclosed that includes a receiver that receives a downlink signal using multiple cells and a transmitter that periodically transmits multiple channel state information using a predetermined transmission time unit length. The user terminal also includes a processor that controls transmission of the channel state information by configuring a transmission period and timing of the multiple channel state information per cell based on a notification from a higher layer.

The invention claimed is: 
     
       1. A terminal comprising:
 a receiver that receives a downlink signal from a base station using carrier aggregation, in which six or more component carriers can be configured, and receives the downlink signal using multiple component carriers among the six or more component carriers; 
 a transmitter that periodically transmits multiple channel state information using a predetermined transmission time unit length; and 
 a processor that controls transmission of the multiple channel state information by configuring, per component carrier, based on a notification from a higher layer, 
 a transmission period of the multiple channel state information, and 
 a timing of the multiple channel state information, 
 wherein when transmitting the multiple channel state information, 
 the processor controls the transmission of the multiple channel state information by configuring the transmission period and the timing per component carrier, and 
 the processor controls the transmission of the multiple channel state information in a Physical Uplink Control Channel (PUCCH) format having a larger capacity than a PUCCH format 3 in Long Term Evolution (LTE), and 
 wherein a spreading factor of the PUCCH format is smaller than a spreading factor of the PUCCH format 3 in LTE. 
 
     
     
       2. The terminal according to  claim 1 , wherein the processor controls the transmission of the multiple channel state information in a resource based on a notification from a higher layer. 
     
     
       3. The terminal according to  claim 1 , wherein, when the processor transmits channel station information for at least one component carrier of the multiple component carriers, the processor controls transmission of the channel state information for the at least one component carrier of the multiple component carriers on a PUCCH of a predetermined component carrier. 
     
     
       4. A radio communication method, for a terminal, comprising:
 receiving a downlink signal from a base station using carrier aggregation, in which six or more component carriers can be configured, and receiving the downlink signal using multiple component carriers among the six or more component carriers; 
 periodically transmitting multiple channel state information using a predetermined transmission time unit length; and 
 controlling transmission of the multiple channel state information by configuring, per component carrier, based on a notification from a higher layer, 
 a transmission period of the multiple channel state information, and 
 a timing of the multiple channel state information, 
 wherein when transmitting the multiple channel state information, 
 the terminal controls the transmission of the multiple channel state information by configuring the transmission period and the timing per component carrier, and 
 the terminal controls the transmission of the multiple channel state information in a Physical Uplink Control Channel (PUCCH) format having a larger capacity than a PUCCH format 3 in Long Term Evolution (LTE), and 
 wherein a spreading factor of the PUCCH format is smaller than a spreading factor of the PUCCH format 3 in LTE.